WebEratosthenes measured the circumference of the Earth without leaving Egypt. He knew that on the summer solstice at local noon at the Syene on the Tropic of Cancer, the sun would appear at the directly overhead.He also knew, from measurement, that in Alexandria, the angle of elevation of the sun would be 1/50 of a full circle (7°12') south of the zenith … WebHowever, the Greek mathematician Eratosthenes was able to estimate the circumference of the Earth over two thousand years ago, without the aid of any modern technology. How? ... Using geometry*, this allowed him to calculate the circumference of the Earth using this equation: He knew there were 360 degrees in a circle. ...
On the Sizes and Distances (Aristarchus) - Wikipedia
WebSep 27, 2015 · The greek way – 240 BC. The very first person to determine the circumference of the earth was Eratosthenes, in sometime around 240 BC. His method was so simple that he just used sticks and geometry … WebJan 11, 2024 · So, if 804 km or 500 mi. (or 5,000 stadia for Eratosthenes) was 1/50th, multiplication gives you the earth's circumference: 500 mi. x 50 = 25,000 mi. 804 km … proactive ict
analysis This measurement is more than 2,200 years old, and its
WebThe measurement of Earth's circumference is the most famous among the results obtained by Eratosthenes, [13] who estimated that the meridian has a length of 252,000 stadia (39,060 to 40,320 kilometres (24,270 to … WebEratosthenes' method to calculate the Earth's circumference has been lost; what has been preserved is the simplified version described by Cleomedes to popularise the discovery. ... A parallel later ancient measurement of the size of the Earth was made by another Greek scholar, Posidonius (c. 135 – 51 BC), ... WebJul 29, 2024 · He could then use simple proportions to find the Earth’s circumference—7.2 degrees is 1/50 of 360 degrees, so 800 times 50 equals 40,000 kilometers. And just like … proactive ibm partner